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    Subject[RFC] [PATCH 8/16] x86_64: Add EFER to the set registers saved by save_processor_state


    EFER varies like %cr4 depending on the cpu capabilities, and which cpu
    capabilities we want to make use of. So save/restore it make certain
    we have the same EFER value when we are done.

    Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
    Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
    ---

    arch/x86_64/kernel/suspend.c | 3 ++-
    include/asm-x86_64/suspend.h | 1 +
    2 files changed, 3 insertions(+), 1 deletion(-)

    diff -puN arch/x86_64/kernel/suspend.c~x86_64-Add-EFER-to-the-set-registers-saved-by-save_processor_state arch/x86_64/kernel/suspend.c
    --- linux-2.6.19-rc5-reloc/arch/x86_64/kernel/suspend.c~x86_64-Add-EFER-to-the-set-registers-saved-by-save_processor_state 2006-11-09 22:58:53.000000000 -0500
    +++ linux-2.6.19-rc5-reloc-root/arch/x86_64/kernel/suspend.c 2006-11-09 22:58:53.000000000 -0500
    @@ -33,7 +33,6 @@ void __save_processor_state(struct saved
    asm volatile ("str %0" : "=m" (ctxt->tr));

    /* XMM0..XMM15 should be handled by kernel_fpu_begin(). */
    - /* EFER should be constant for kernel version, no need to handle it. */
    /*
    * segment registers
    */
    @@ -50,6 +49,7 @@ void __save_processor_state(struct saved
    /*
    * control registers
    */
    + rdmsrl(MSR_EFER, ctxt->efer);
    asm volatile ("movq %%cr0, %0" : "=r" (ctxt->cr0));
    asm volatile ("movq %%cr2, %0" : "=r" (ctxt->cr2));
    asm volatile ("movq %%cr3, %0" : "=r" (ctxt->cr3));
    @@ -75,6 +75,7 @@ void __restore_processor_state(struct sa
    /*
    * control registers
    */
    + wrmsrl(MSR_EFER, ctxt->efer);
    asm volatile ("movq %0, %%cr8" :: "r" (ctxt->cr8));
    asm volatile ("movq %0, %%cr4" :: "r" (ctxt->cr4));
    asm volatile ("movq %0, %%cr3" :: "r" (ctxt->cr3));
    diff -puN include/asm-x86_64/suspend.h~x86_64-Add-EFER-to-the-set-registers-saved-by-save_processor_state include/asm-x86_64/suspend.h
    --- linux-2.6.19-rc5-reloc/include/asm-x86_64/suspend.h~x86_64-Add-EFER-to-the-set-registers-saved-by-save_processor_state 2006-11-09 22:58:53.000000000 -0500
    +++ linux-2.6.19-rc5-reloc-root/include/asm-x86_64/suspend.h 2006-11-09 22:58:53.000000000 -0500
    @@ -17,6 +17,7 @@ struct saved_context {
    u16 ds, es, fs, gs, ss;
    unsigned long gs_base, gs_kernel_base, fs_base;
    unsigned long cr0, cr2, cr3, cr4, cr8;
    + unsigned long efer;
    u16 gdt_pad;
    u16 gdt_limit;
    unsigned long gdt_base;
    _
    -
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